Re: [PATCH -v4 0/2] mm: vmscan: fix node reclaim ignoring swappiness parameter

[Ridong Chen]

On 7/24/2026 8:34 AM, Andrew Morton wrote:
> On Thu, 23 Jul 2026 11:24:32 +0800 Ridong <ridong.chen@xxxxxxxxx> wrote:
>
> > From: Ridong Chen <chenridong@xxxxxxxxxx>
> >
> > The per-node proactive reclaim interface
> > (/sys/devices/system/node/nodeX/reclaim) accepts a swappiness parameter,
> > but it is silently ignored when CONFIG_MEMCG is disabled. The root cause
> > is that sc_swappiness() has separate implementations for CONFIG_MEMCG and
> > !CONFIG_MEMCG, and the latter never checks proactive_swappiness.
> >
> > Patch 1 moves mem_cgroup_swappiness() and vm_swappiness out of the public
> > include/linux/swap.h into the mm-private mm/swap.h, and makes the helper
> > handle both CONFIG_MEMCG and !CONFIG_MEMCG in a single inline function.
> > This is a prerequisite for unifying sc_swappiness().
> >
> > Patch 2 consolidates sc_swappiness() into a single definition that works
> > regardless of CONFIG_MEMCG, fixing the node reclaim swappiness bug.
>
> Thanks, I updated mm.git to this version.
Thanks.

--
Best regards
Ridong